Camera lens and lens assembly

Abstract

The application relates to the field of optical lenses, and discloses a camera optical lens and a lens assembly. The camera optical lens comprises, from the object side to the image side, a first lens with positive refractive power, a second lens with negative refractive power, a third lens with negative refractive power, a fourth lens with negative refractive power, and an image surface. The first lens has, along the direction of the optical path, a first refractive surface, a first reflective surface, a second reflective surface, and a second refractive surface in sequence. The focal length of the camera optical lens is f, the image height of the 1.0 field of view of the camera optical lens is IH, the total optical length of the camera optical lens is TTL, the focal length of the third lens is f3, the central curvature radius of the object side surface of the third lens is R5, the central curvature radius of the image side surface of the third lens is R6, and the following relationships are satisfied: 6.20 <= fIH / TTL <= 10.10; 1.00 <= f3 / (R5+R6) <= 3.20.

Description

Technical Field

[0001] This invention relates to the field of optical lenses, and in particular to a camera optical lens suitable for handheld terminal devices such as smartphones and digital cameras, as well as camera devices such as monitors and PC lenses. Background Technology

[0002] In recent years, with the rise of various smart devices, the demand for miniaturized camera lenses has been increasing. Due to the shrinking pixel size of image sensors and the current trend in electronic products towards high functionality and lightweight portability, miniaturized camera lenses with good image quality have become mainstream in the market. To achieve better image quality, multi-element lens structures are often used. Furthermore, with technological advancements and increasingly diverse user needs, as the pixel area of ​​image sensors continues to shrink and system requirements for image quality continue to rise, four-element lens structures are gradually appearing in lens designs. There is an urgent need for telephoto camera lenses with excellent optical characteristics, small size, and adequate aberration correction. Summary of the Invention

[0003] To address the aforementioned problems, the main objective of this invention is to provide a camera optical lens and lens assembly that possesses excellent optical performance while meeting the design requirements of large aperture, ultra-thinness, and miniaturization.

[0004] To achieve the above objectives, in a first aspect, the present invention provides a camera optical lens, which comprises four lenses and an image plane. The four lenses, from the object side to the image side, are sequentially: a first lens with positive refractive power, a second lens with negative refractive power, a third lens with negative refractive power, and a fourth lens with negative refractive power, wherein: The first lens has a first refractive surface, a first reflective surface, a second reflective surface, and a second refractive surface sequentially along the optical path. The first refractive surface and the second reflective surface constitute the object-side surface of the first lens. The second reflective surface is located in the central region of the object-side surface of the first lens, and the first refractive surface is located outside the second reflective surface. The first reflective surface and the second refractive surface constitute the image-side surface of the first lens. The second refractive surface is located in the central region of the image-side surface of the first lens, and the first reflective surface is located outside the second refractive surface. Light enters the first lens through the first refractive surface and is reflected at the first reflective surface. The light reflected by the first reflective surface is reflected at the second reflective surface and exits through the second refractive surface to the second lens. After passing through the second lens, the third lens, and the fourth lens, an image is formed on the image surface. High-reflection coatings are provided on the first reflective surface and the second reflective surface, and anti-reflection coatings are provided on the first refractive surface and the second refractive surface. The focal length of the camera optical lens is f, the image height of the camera optical lens with a 1.0 field of view is IH, the axial distance from the first refractive surface to the image surface is TTL, the focal length of the third lens is f3, the central radius of curvature of the object side of the third lens is R5, and the central radius of curvature of the image side of the third lens is R6, and the following relationship is satisfied: 6.20≤f IH / TTL≤10.10; 1.00≤f3 / (R5+R6)≤3.20.

[0005] Preferably, the maximum effective radius of the first reflecting surface is DR1, the maximum effective radius of the second reflecting surface is DR2, and they satisfy the following relationship: 0.40≤DR2 / DR1≤0.51.

[0006] Preferably, the refractive index of the d-line of the first lens is nd1, the on-axis thickness of the first lens is d1, and the following relationship is satisfied: 1.10≤nd1 d1 / (IH 2)≤1.70.

[0007] Preferably, the refractive index of the d-line of the first lens is nd1, the Abbe number of the first lens is vd1, and the following relationship is satisfied: 22.00≤vd1 / nd1≤55.00.

[0008] Preferably, the first refractive surface is a plane, the second reflective surface is concave near the axis, and the second refractive surface is convex near the axis; The focal length of the first lens is f1, the axial thickness of the first lens is d1, the central radius of curvature of the second reflecting surface of the first lens is Rm3, and the central radius of curvature of the second refracting surface of the first lens is R2, and they satisfy the following relationship: 0.50≤f1 / f≤0.65; -3.82≤(Rm3+R2) / (Rm3-R2)≤-2.49; 0.240≤d1 / TTL≤0.454.

[0009] Preferably, the object-side surface of the second lens is convex at the paraxial position, and the image-side surface of the second lens is concave at the paraxial position. The focal length of the second lens is f2, the central radius of curvature of the object side of the second lens is R3, the central radius of curvature of the image side of the second lens is R4, and the axial thickness of the second lens is d3, satisfying the following relationship: -4.50≤f² / f≤-0.60; 1.25≤(R3+R4) / (R3-R4)≤18.50; 0.040≤d3 / TTL≤0.062.

[0010] Preferably, the object-side surface of the third lens is concave near the axis, and the image-side surface of the third lens is convex near the axis. The axial thickness of the third lens is d5, and it satisfies the following relationship: -0.99≤f3 / f≤-0.22; -5.10≤(R5+R6) / (R5-R6)≤-2.41; 0.062≤d5 / TTL≤0.098.

[0011] Preferably, the focal length of the fourth lens is f4, the central radius of curvature of the object-side surface of the fourth lens is R7, the central radius of curvature of the image-side surface of the fourth lens is R8, and the axial thickness of the fourth lens is d7, and satisfies the following relationship: -3.90≤f4 / f≤-2.20; -5.60≤(R7+R8) / (R7-R8)≤11.40; 0.039≤d7 / TTL≤0.088.

[0012] Preferably, the first lens is made of glass.

[0013] Secondly, the present invention provides a lens assembly, including a lens barrel and the aforementioned imaging optical lens, wherein the imaging optical lens is housed within the lens barrel, and the first lens, the second lens, the third lens, and the fourth lens are sequentially distributed from the object side to the image side, wherein: The lens barrel has a first bearing surface and a second bearing surface facing the object side. The image side of the first lens has a first mounting surface, and the first mounting surface rests on the first bearing surface. The image side of the fourth lens has a second mounting surface, and the second mounting surface rests on the second bearing surface.

[0014] The beneficial effects of this invention are as follows: the camera optical lens according to this invention has excellent optical characteristics, the system has better imaging quality and lower sensitivity, which helps to achieve telephoto and ultra-thin lenses with large target surfaces. It has the characteristics of large aperture, ultra-thinness, and miniaturization, and is easy to correct distortion and on-axis chromatic aberration, making it particularly suitable for mobile phone camera lens assemblies and web camera lenses composed of high-pixel CCD, CMOS and other camera elements. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein: Figure 1 This is a schematic diagram of the structure of the camera optical lens according to the first embodiment of the present invention; Figure 2 yes Figure 1 A schematic diagram of axial aberrations of the camera optical lens shown; Figure 3 yes Figure 1 A schematic diagram of chromatic aberration at magnification for a camera lens; Figure 4 yes Figure 1 A schematic diagram of field curvature and distortion of the camera optical lens shown; Figure 5 This is a schematic diagram of the structure of the camera optical lens according to the second embodiment of the present invention; Figure 6 yes Figure 5 A schematic diagram of axial aberrations of the camera optical lens shown; Figure 7 yes Figure 5 A schematic diagram of chromatic aberration at magnification for a camera lens; Figure 8 yes Figure 5 A schematic diagram of field curvature and distortion of the camera optical lens shown; Figure 9 This is a schematic diagram of the structure of the camera optical lens according to the third embodiment of the present invention; Figure 10 yes Figure 9 A schematic diagram of axial aberrations of the camera optical lens shown; Figure 11 yes Figure 9 A schematic diagram of chromatic aberration at magnification for a camera lens; Figure 12 yes Figure 9 A schematic diagram of field curvature and distortion of the camera optical lens shown; Figure 13 This is a schematic diagram of the lens assembly provided by the present invention. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this invention clearer, the various embodiments of this invention will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the various embodiments of this invention to facilitate a better understanding of the invention. However, the technical solutions claimed in this invention can be implemented even without these technical details and with various variations and modifications based on the following embodiments.

[0017] Referring to the accompanying drawings, the technical solution of the present invention provides a camera optical lens 10, 20, 30. Figure 1 , 5 Figures 1 and 9 show the camera optical lenses 10, 20, and 30 of the present invention. The camera optical lenses 10, 20, and 30 include, from the object side to the image side, an aperture S1, a first lens L1 with positive refractive power, a second lens L2 with negative refractive power, a third lens L3 with negative refractive power, a fourth lens L4 with negative refractive power, and an image plane Si. An optical filter GF and other optical elements may be disposed between the fourth lens L4 and the image plane Si.

[0018] Reference Figure 1 As shown, the first lens L1, along the optical path, sequentially comprises a first refractive surface B1, a first reflective surface B2, a second reflective surface B3, and a second refractive surface B4. The first refractive surface B1 and the second reflective surface B3 constitute the object-side surface Bw of the first lens L1. The object-side surface Bw includes an object-side central region Z1 and an object-side outer ring region Z3. The second reflective surface B3 is located in the object-side central region Z1 of the object-side surface Bw of the first lens L1, and the first refractive surface B1 is located outside the second reflective surface B3, i.e., in the object-side outer ring region Z3 of the object-side surface Bw. The first reflective surface B2 and the second refractive surface B4 constitute the image-side surface Bx of the first lens L1. The image-side surface Bx of the first lens L1 includes an image-side central region Z2 and an image-side outer ring region Z4. The second refractive surface B4 is located in the image-side central region Z2 of the image-side surface Bx of the first lens L1, and the first reflective surface B2 is located outside the second refractive surface B4, i.e., in the image-side outer ring region Z4 of the image-side surface Bx.

[0019] Light rays travel along a first direction T1, passing through the first refractive surface B1 and entering the first lens L1. They are reflected at the first reflective surface B2, and the reflected light travels along a second direction T2, being reflected again at the second reflective surface B3. Then, it travels along a third direction T3, passing through the second refractive surface B4 and exiting into the second lens L2. After passing through the second lens L2, the third lens L3, and the fourth lens L4, an image is formed on the image plane Si. The light rays repeatedly refract within the first lens L1, significantly shortening the overall length of the lens and achieving ultra-thinness.

[0020] The focal lengths of the camera optical lenses 10, 20, and 30 are f, the image height of the 1.0 field of view of the camera optical lenses 10, 20, and 30 is IH, the on-axis distance from the first refractive surface B1 to the image plane Si is TTL, the focal length of the third lens L3 is f3, the central radius of curvature of the object side of the third lens L3 is R5, and the central radius of curvature of the image side of the third lens L3 is R6, and the following relationship is satisfied: 6.20≤f IH / TTL≤10.10; helps to achieve telephoto and ultra-thin lenses with large target surfaces.

[0021] 1.00≤f3 / (R5+R6)≤3.20, optimize the field curvature and distortion of the system to ensure the imaging quality of the edge field of view.

[0022] Furthermore, the first lens L1 has a high-reflectivity coating deposited on the areas where the first reflecting surface B2 and the second reflecting surface B3 are located to ensure reflection efficiency. The first lens L1 also has an anti-reflection coating deposited on the areas where the first refractive surface B1 and the second refractive surface B4 are located to reduce unnecessary reflection loss and improve light transmittance. By using partitioned coating, the first lens L1 simultaneously possesses refractive and reflective functions, thereby achieving a catadioptric reflection effect.

[0023] Under the above conditions, camera optical lenses 10, 20, and 30 exhibit good optical performance, while the system also boasts superior image quality and low sensitivity, facilitating the realization of telephoto lenses with large apertures and ultra-thin designs. They feature large apertures, ultra-thinness, and miniaturization, and are easy to correct for distortion and on-axis chromatic aberration, making them particularly suitable for mobile phone camera lens assemblies and web camera lenses composed of high-pixel CCD, CMOS, and other imaging elements.

[0024] Define the maximum effective radius of the first lens L1 at the first reflecting surface B2 as DR1, and the maximum effective radius of the first lens L1 at the second reflecting surface B3 as DR2, satisfying the following relationship: 0.40≤DR2 / DR1≤0.51. By controlling the ratio of the effective diameters of the first reflecting surface B2 and the second reflecting surface B3, the proportion of the light-blocked portion of the lens is controlled, maintaining the amount of light transmitted while controlling image quality, and obtaining higher resolution.

[0025] The refractive index of the d-line of the first lens L1 is defined as nd1, and the on-axis thickness of the first lens L1 is d1, satisfying the following relationship: 1.10 ≤ nd1 d1 / (IH 2) ≤1.70. By controlling the ratio of optical path length to image height, on-axis and off-axis aberrations are effectively balanced, ensuring image sharpness.

[0026] The refractive index of the d-line of the first lens L1 is defined as nd1, and the Abbe number of the first lens L1 is vd1, satisfying the following relationship: 22.00≤vd1 / nd1≤55.00. The first lens L1 is made of glass. The dispersive characteristics of the material are controlled by controlling the ratio of refractive index to Abbe number. Satisfying this condition is beneficial for correcting the chromatic aberration of the lens in the imaging system.

[0027] Based on the above conditional expressions and the functions that can be achieved, the characteristics of each lens are further refined as follows.

[0028] The first refractive surface B1 of the first lens L1 is planar, the second reflecting surface B3 is concave near the axis, and the second refractive surface B4 is convex near the axis. The first lens L1 has positive refractive power. The object-side and image-side surfaces of the first lens L1 can also be configured with other concave and convex distributions.

[0029] The focal length of the first lens L1 is defined as f1, which satisfies the following relationship: 0.50≤f1 / f≤0.65. By controlling the positive optical power of the first lens L1 within a reasonable range, it is beneficial to correct the aberrations of the camera optical lenses 10, 20, and 30.

[0030] Define the central radius of curvature of the second reflecting surface B3 of the first lens L1 as Rm3, and the central radius of curvature of the second refractive surface B4 of the first lens L1 as R2, satisfying the following relationship: -3.82≤(Rm3+R2) / (Rm3-R2)≤-2.49. Reasonably control the shape of the first lens L1 so that the first lens L1 can effectively correct the spherical aberration of the system.

[0031] The on-axis thickness of the first lens L1 is d1, which satisfies the following relationship: 0.240≤d1 / TTL≤0.454. Within the range of the condition, it is beneficial to achieve ultra-thinness.

[0032] The object-side surface of the second lens L2 is convex near the axis, and the image-side surface is concave near the axis. The second lens L2 has negative refractive power. The object-side and image-side surfaces of the second lens L2 can also be configured with other concave and convex distributions.

[0033] The focal length of the second lens L2 is defined as f2, which satisfies the following relationship: -4.50≤f2 / f≤-0.60. By controlling the negative optical power of the second lens L2 within a reasonable range, it is beneficial to correct the aberrations of the camera optical lenses 10, 20, and 30.

[0034] The center radius of curvature of the object side of the second lens L2 is R3, and the center radius of curvature of the image side of the second lens L2 is R4, satisfying the following relationship: 1.25≤(R3+R4) / (R3-R4)≤18.50, which defines the shape of the second lens L2. When within this range, as lenses develop towards ultra-thinness, it is beneficial to correct on-axis chromatic aberration.

[0035] The on-axis thickness of the second lens L2 is d3, which satisfies the following relationship: 0.040≤d3 / TTL≤0.062. Within the range of the condition, it is beneficial to achieve ultra-thinness.

[0036] The object-side surface of the third lens L3 is concave near the axis, and the image-side surface is convex near the axis. The third lens L3 has negative refractive power. The object-side and image-side surfaces of the third lens L3 can also be configured with other concave and convex distributions.

[0037] The following relationship is satisfied: -0.99≤f3 / f≤-0.22. Through the reasonable allocation of optical power, the system has better imaging quality and lower sensitivity.

[0038] The following relationship is satisfied: -5.10≤(R5+R6) / (R5-R6)≤-2.41, which specifies the shape of the third lens L3, which is beneficial to the shaping of the third lens L3. Within the range specified by the condition, it can mitigate the degree of light deflection after passing through the lens and effectively reduce aberrations.

[0039] The on-axis thickness of the third lens L3 is d5, which satisfies the following relationship: 0.062≤d5 / TTL≤0.098. Within the range of the condition, it is beneficial to achieve ultra-thinness.

[0040] The object side of the fourth lens L4 is either convex or concave near the axis, and the image side is either convex or concave near the axis. The fourth lens L4 has negative refractive power.

[0041] The focal length of the fourth lens L4 is defined as f4, which satisfies the following relationship: -3.90≤f4 / f≤-2.20. Through the reasonable allocation of optical power, the system has better imaging quality and lower sensitivity.

[0042] The center radius of curvature of the object side of the fourth lens L4 is R7, and the center radius of curvature of the image side of the fourth lens L4 is R8, and they satisfy the following relationship: -5.60≤(R7+R8) / (R7-R8)≤11.40, which defines the shape of the fourth lens L4. When within this range, with the development of ultra-thinness, it is beneficial to correct aberrations and other problems in off-axis drawing angles.

[0043] The on-axis thickness of the fourth lens L4 is d7, which satisfies the following relationship: 0.039≤d7 / TTL≤0.088. Within the range of the condition, it is beneficial to achieve ultra-thinness.

[0044] The camera optical lenses 10, 20, and 30 satisfy the following relationship: 4.78≤TTL / IH≤5.27, which is beneficial for achieving ultra-thin design.

[0045] The first lens L1 is made of glass, the second lens L2 is made of plastic, the third lens L3 is made of plastic, and the fourth lens L4 is made of plastic. The second lens L2, the third lens L3, and the fourth lens L4 can also be made of other materials.

[0046] The following examples illustrate the camera optical lenses 10, 20, and 30 of the present invention. The symbols used in each example are shown below. The units for focal length, on-axis distance, center radius of curvature, and on-axis thickness are mm.

[0047] Aperture value FNO: refers to the ratio of the effective focal length to the entrance pupil diameter of a camera lens at f / 10, f / 20, and f / 30.

[0048] Image height IH of 1.0 field of view: The field of view height corresponding to the effective pixel of the sensor (i.e., half the diagonal length of the effective pixel area of ​​the sensor). 1.0 Field of View (FOV): The field of view angle corresponding to the effective pixel of the sensor; The technical solution of the present invention will be described in detail below with three embodiments.

[0049] (First Implementation) In this embodiment, the first lens L1 is made of glass, the second lens L2 is made of plastic, the third lens L3 is made of plastic, and the fourth lens L4 is made of plastic.

[0050] The first refractive surface B1 of the first lens L1 is flat, the second reflecting surface B3 is concave near the axis, and the second refractive surface B4 is convex near the axis; the object side of the second lens L2 is convex near the axis, and the image side is concave near the axis; the object side of the third lens L3 is concave near the axis, and the image side is convex near the axis; the object side of the fourth lens L4 is convex near the axis, and the image side is concave near the axis.

[0051] The first lens L1 has positive refractive power, the second lens L2 has negative refractive power, the third lens L3 has negative refractive power, and the fourth lens L4 has negative refractive power.

[0052] Tables 1 and 2 show the design data of the camera optical lens 10 according to the first embodiment of the present invention.

[0053] Table 1

[0054] The meanings of each symbol are as follows.

[0055] S1: Aperture (circular aperture, such as...) Figure 1 As shown, it includes the inner edge and the outer edge of S1. The inner edge of S1 is flush with the outer edge of the second reflecting surface B3, and the outer edge of S1 is closer to the optical axis T0 than the outer edge of the first refractive surface B1. R: Radius of curvature at the center of the optical surface; R1: The central radius of curvature of the first refractive surface B1 of the first lens L1; Rm1: The central radius of curvature of the first reflecting surface B2 of the first lens L1; Rm3: The central radius of curvature of the second reflecting surface B3 of the first lens L1; R2: The central radius of curvature of the second refractive surface B4 of the first lens L1 (the central radius of curvature and aspherical coefficient of the second refractive surface B4 are the same as those of the first reflective surface B2. The image side Bx of the first lens L1 is divided into the image side central region Z2 and the image side outer ring region Z4. The image side central region Z2 is provided with an anti-reflection coating to form the second refractive surface B4, and the image side outer ring region Z4 is provided with a high reflectivity coating to form the first reflective surface B2). R3: The central radius of curvature of the object-side surface of the second lens L2; R4: The central radius of curvature of the image-side surface of the second lens L2; R5: The central radius of curvature of the object-side surface of the third lens L3; R6: The central radius of curvature of the image-side surface of the third lens L3; R7: The central radius of curvature of the object side surface of the fourth lens L4; R8: The central radius of curvature of the image-side surface of the fourth lens L4; R9: The center radius of curvature of the object side surface of the optical filter GF; R10: Radius of curvature of the center of the image side of the optical filter GF; d: Axial thickness of the lens, axial distance between lenses; d0: The axial distance from aperture S1 to the first refractive surface B1 of the first lens L1; TR12: The axial distance from the first refractive surface B1 to the first reflective surface B2 of the first lens L1; (Since the surface coefficients of the first reflective surface B2 and the second refractive surface B4 are the same, the point where the first reflective surface B2 extends to the optical axis T0 coincides with the axial point of the second refractive surface B4 in the optical system. Also, since the first refractive surface B1 is planar and the second reflective surface B3 is concave towards the object side, TR12 is the sum of the absolute values ​​of the sagittal heights of the later-appearing d1 and the outer edges of the second reflective surface B3.) TR23: The on-axis distance from the first reflecting surface B2 to the second reflecting surface B3 of the first lens L1 (since the surface coefficients of the first reflecting surface B2 and the second refractive surface B4 are the same, the point where the first reflecting surface B2 extends to the optical axis T0 coincides with the on-axis point of the second refractive surface B4 in the optical system. TR23 has the same absolute value as d1, but has the opposite sign to d1 due to the different directions of light propagation). d1: The on-axis thickness from the second reflecting surface B3 to the second refracting surface B4 of the first lens L1; d2: The axial distance from the second refracting surface B4 of the first lens L1 to the object-side surface of the second lens L2; d3: On-axis thickness of the second lens L2; d4: The axial distance from the image-side surface of the second lens L2 to the object-side surface of the third lens L3; d5: On-axis thickness of the third lens L3; d6: The on-axis distance from the image-side surface of the third lens L3 to the object-side surface of the fourth lens L4; d7: On-axis thickness of the fourth lens L4; d8: The on-axis distance from the image side of the fourth lens L4 to the object side of the optical filter GF; d9: On-axis thickness of the optical filter GF; d10: The on-axis distance from the image-side surface of the optical filter GF to the image plane Si; nd: Refractive index of the d-line (wavelength of the d-line is 587.56 nm); nd1: The refractive index of the d-line of the first lens L1; nd2: The refractive index of the d-line of the second lens L2; nd3: The refractive index of the d-line of the third lens L3; nd4: The refractive index of the d-line of the fourth lens L4; ndg: The refractive index of the d-line of the optical filter GF; vd: Abbe number; v1: Abbe number of the first lens L1; v2: Abbe number of the second lens L2; v3: Abbe number of the third lens L3; v4: Abbe number of the fourth lens L4; vg: Abbe number of the optical filter GF.

[0056] Table 2 shows the aspherical data of each lens in the camera optical lens 10 of the first embodiment of the present invention.

[0057] Table 2

[0058] For convenience, the aspherical surfaces of each lens surface are as shown in the following formula (1). However, the present invention is not limited to the aspherical polynomial form represented by formula (1).

[0059] z=(cr 2 ) / {1+[1-(k+1)(c 2 r 2 )]1 / 2}+A4r 4 +A6r 6 +A8r 8 +A10r 10 (1) Where k is the conic coefficient, A4, A6, A8, and A10 are aspheric coefficients, c is the curvature at the center of the optical surface, r is the perpendicular distance between a point on the aspheric curve and the optical axis, and z is the aspheric depth (the perpendicular distance between a point on the aspheric surface at a distance r from the optical axis and the tangent plane at the vertex of the aspheric optical axis).

[0060] Figure 2 , Figure 3 Axial aberration and magnification chromatic aberration are shown respectively after light with wavelengths of 650nm, 610nm, 555nm, 510nm and 470nm passes through the camera optical lens 10 of the first embodiment. Figure 4 This shows a schematic diagram of field curvature and distortion after light with a wavelength of 555nm passes through the camera optical lens 10 of the first embodiment. Figure 4 The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0061] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 10 is 3.150 mm, the image height IH of the 1.0 field of view is 3.594 mm, and the field of view FOV of the 1.0 field of view is 10.13°. The camera optical lens 10 meets the design requirements of large aperture, miniaturization, and ultra-thinness. Its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0062] (Second Implementation) The symbols in the second embodiment have the same meanings as those in the first embodiment.

[0063] Figure 5 The image shown is the camera optical lens 20 according to the second embodiment of the present invention.

[0064] Tables 3 and 4 show the design data of the camera optical lens 20 according to the second embodiment of the present invention.

[0065] Table 3

[0066] Table 4 shows the aspherical data of each lens in the camera optical lens 20 of the second embodiment of the present invention.

[0067] Table 4

[0068] Figure 6 , Figure 7Axial aberration and magnification chromatic aberration are shown respectively after light with wavelengths of 650nm, 610nm, 555nm, 510nm and 470nm passes through the camera optical lens 20 of the second embodiment. Figure 8 This shows a schematic diagram of field curvature and distortion after light with a wavelength of 555nm passes through the camera optical lens 20 of the second embodiment. Figure 8 The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0069] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 20 is 3.150mm, the image height IH of the 1.0 field of view is 3.594mm, and the field of view FOV of the 1.0 field of view is 7.41°. The camera optical lens 20 meets the design requirements of large aperture, miniaturization, and ultra-thinness. Its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0070] (Third implementation method) The symbols in the third embodiment have the same meanings as those in the first embodiment. The difference from the first embodiment is that the object-side surface of the fourth lens L4 is concave near the axis, while the image-side surface is convex near the axis.

[0071] Figure 9 The image shown is the camera optical lens 30 according to the third embodiment of the present invention.

[0072] Tables 5 and 6 show the design data of the camera optical lens 30 according to the third embodiment of the present invention.

[0073] Table 5

[0074] Table 6 shows the aspherical data of each lens in the camera optical lens 30 of the third embodiment of the present invention.

[0075] Table 6

[0076] Figure 10 , Figure 11 Axial aberration and magnification chromatic aberration are shown respectively after light with wavelengths of 650nm, 610nm, 555nm, 510nm and 470nm passes through the camera optical lens 30 of the third embodiment. Figure 12 This shows a schematic diagram of field curvature and distortion after light with a wavelength of 555nm passes through the camera optical lens 30 of the third embodiment. Figure 12 The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0077] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 30 is 3.150mm, the image height IH of the 1.0 field of view is 3.594mm, and the field of view FOV of the 1.0 field of view is 11.74°. The camera optical lens 30 meets the design requirements of large aperture, miniaturization, and ultra-thinness. Its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0078] Table 7 shows the values ​​corresponding to various numerical values ​​and parameters specified in the conditional expressions for each of the three implementation methods.

[0079] Table 7

[0080] Secondly, referring to Figure 13 As shown, the present invention provides a lens assembly 100, including a lens barrel P and the aforementioned imaging optical lenses 10, 20, and 30. The imaging optical lenses 10, 20, and 30 are housed within the lens barrel P. A first lens L1, a second lens L2, a third lens L3, and a fourth lens L4 are sequentially distributed from the object side to the image side. The first lens L1 is located at the front end closest to the object side. Two stepped support planes are machined inside the lens barrel P. The lens barrel P has a first bearing surface G1 and a second bearing surface G2 facing the object side. The inner diameter of the cavity where the first bearing surface G1 is located is larger than the inner diameter of the cavity where the second bearing surface G2 is located, so as to facilitate the assembly of the relatively large-volume L1 lens and further better realize the catadioptric and reflective function of the first lens L1.

[0081] The image side of the first lens L1 has a first mounting surface M1. A flat annular mounting end face is machined on the outer periphery of the image side of the first lens L1 as the first mounting surface M1. The first mounting surface M1 rests on the first bearing surface G1. The first lens L1, which has the largest volume, is installed into the lens barrel P from the object side. The first mounting surface M1 of the annular structure at the rear end of the first lens L1 fits against the first bearing surface G1 near the object side of the lens barrel P to complete the limiting installation.

[0082] The image side of the fourth lens L4 has a second mounting surface M2. A flat annular mounting end face is machined on the outer periphery of the image side of the fourth lens L4 to serve as the second mounting surface M2. The second mounting surface M2 rests against the second bearing surface G2, and the end-positioning is achieved by the second mounting surface M2 at the rear end of the fourth lens L4 abutting against the second bearing surface G2. This precisely fixes each lens, prevents internal reflected light path deviation, meets high-precision assembly requirements, and reduces the difficulty of processing and assembly.

[0083] Those skilled in the art will understand that the above embodiments are specific implementations of the present invention, and in practical applications, various changes can be made in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A camera optical lens, characterized in that, The camera optical lens comprises four lenses and an image plane. The four lenses, from the object side to the image side, are in the following order: a first lens with positive refractive power, a second lens with negative refractive power, a third lens with negative refractive power, and a fourth lens with negative refractive power. The first lens has a first refractive surface, a first reflective surface, a second reflective surface, and a second refractive surface sequentially along the optical path. The first refractive surface and the second reflective surface constitute the object-side surface of the first lens. The second reflective surface is located in the central region of the object-side surface of the first lens, and the first refractive surface is located outside the second reflective surface. The first reflective surface and the second refractive surface constitute the image-side surface of the first lens. The second refractive surface is located in the central region of the image-side surface of the first lens, and the first reflective surface is located outside the second refractive surface. Light enters the first lens through the first refractive surface and is reflected at the first reflective surface. The light reflected by the first reflective surface is reflected at the second reflective surface and exits through the second refractive surface to the second lens. After passing through the second lens, the third lens, and the fourth lens, an image is formed on the image surface. High-reflection coatings are provided on the first reflective surface and the second reflective surface, and anti-reflection coatings are provided on the first refractive surface and the second refractive surface. The focal length of the camera optical lens is f, the image height of the camera optical lens with a 1.0 field of view is IH, the axial distance from the first refractive surface to the image surface is TTL, the focal length of the third lens is f3, the central radius of curvature of the object side of the third lens is R5, and the central radius of curvature of the image side of the third lens is R6, and the following relationship is satisfied: 6.20≤f IH / TTL≤10.10; 1.00≤f3 / (R5+R6)≤3.

20.

2. The camera optical lens according to claim 1, characterized in that, The maximum effective radius of the first reflecting surface is DR1, and the maximum effective radius of the second reflecting surface is DR2, and they satisfy the following relationship: 0.40≤DR2 / DR1≤0.

51.

3. The camera optical lens according to claim 1, characterized in that, The refractive index of the d-line of the first lens is nd1, the on-axis thickness of the first lens is d1, and the following relationship is satisfied: 1.10≤nd1 d1 / (IH 2) ≤1.

70.

4. The camera optical lens according to claim 1, characterized in that, The refractive index of the d-line of the first lens is nd1, the Abbe number of the first lens is vd1, and the following relationship is satisfied: 22.00≤vd1 / nd1≤55.

00.

5. The camera optical lens according to claim 1, characterized in that, The first refractive surface is a plane, the second reflective surface is concave near the axis, and the second refractive surface is convex near the axis; The focal length of the first lens is f1, the axial thickness of the first lens is d1, the central radius of curvature of the second reflecting surface of the first lens is Rm3, and the central radius of curvature of the second refracting surface of the first lens is R2, and they satisfy the following relationship: 0.50≤f1 / f≤0.65; -3.82≤(Rm3+R2) / (Rm3-R2)≤-2.49; 0.240≤d1 / TTL≤0.

454.

6. The camera optical lens according to claim 1, characterized in that, The object-side surface of the second lens is convex at the paraxial position, and the image-side surface of the second lens is concave at the paraxial position. The focal length of the second lens is f2, the central radius of curvature of the object side of the second lens is R3, the central radius of curvature of the image side of the second lens is R4, and the axial thickness of the second lens is d3, satisfying the following relationship: -4.50≤f² / f≤-0.60; 1.25≤(R3+R4) / (R3-R4)≤18.50; 0.040≤d3 / TTL≤0.

062.

7. The camera optical lens according to claim 1, characterized in that, The object-side surface of the third lens is concave near the axis, and the image-side surface of the third lens is convex near the axis. The axial thickness of the third lens is d5, and it satisfies the following relationship: -0.99≤f3 / f≤-0.22; -5.10≤(R5+R6) / (R5-R6)≤-2.41; 0.062≤d5 / TTL≤0.

098.

8. The camera optical lens according to claim 1, characterized in that, The fourth lens has a focal length of f4, a central radius of curvature of the object side of the fourth lens of R7, a central radius of curvature of the image side of the fourth lens of R8, and an axial thickness of d7, and satisfies the following relationship: -3.90≤f4 / f≤-2.20; -5.60≤(R7+R8) / (R7-R8)≤11.40; 0.039≤d7 / TTL≤0.

088.

9. The camera optical lens according to claim 1, characterized in that, The first lens is made of glass.

10. A lens assembly, characterized in that, The system includes a lens barrel and a camera optical lens as described in any one of claims 1-9, wherein the camera optical lens is housed within the lens barrel, and the first lens, the second lens, the third lens, and the fourth lens are sequentially distributed from the object side to the image side, wherein: The lens barrel has a first bearing surface and a second bearing surface facing the object side. The image side of the first lens has a first mounting surface, and the first mounting surface rests on the first bearing surface. The image side of the fourth lens has a second mounting surface, and the second mounting surface rests on the second bearing surface.

Images